PatentVote.com: Vote on your favourite invention!

Next ten patents ordered by date:
Fluoroelastomer composition
Process for removing residual volatile solvent impurities from polymer molding pellets
Utilization of oxygen difluoride for syntheses of fluoropolymers
Suspension polymerization process for ethylenic monomers
Process and apparatus for the separating out of coarse and/or heavy particles from a variable particle size and/or variable particle weight mixture of granular solids maintained in a vortex state
Process for reusing polymerization solvent by recycling
Catalytic production of a high molecular weight cis-1,4-polyisoprene
Herbicidal compositions
Tripeptides having an antidepressive and prolactin-releasing action
(H-gly-gly-tyr-ala).sup.1 -somatostatin
Translate:
En
De
Es
Fr
It
Pt
Ja
Ko
Zh 

 

Title: Process for preparing copolymer of acrylonitrile and aromatic vinyl compound



Do you think this is a good invention? Vote now:

 Votes so far: For:(0) Against:(0)
Claims: What is claimed is:

1. A process for preparing a copolymer of acrylonitrile and an aromatic vinyl compound comprising suspension polymerizing acrylonitrile and an aromatic vinyl compound chosen from the group consisting of styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene and .alpha.-methylstyrene in an initial weight ratio of acrylonitrile to vinyl compound of 30-50: 70-50 which is during the process adjusted to a ratio of 20-35: 80-65 by the addition of vinyl compound, in the presence of at least one azo catalyst selected from the group consisting of 1,1'-azobiscyclohexanitrile, 1,1'-azobiscycloheptanitrile, 2,2'-azobis(2-nitropropane), 2,2'-azobis-(2-thiocyanopropane) and 2,2'-azobis(2-methoxycarbonyl propane) and at least one peroxide catalyst selected from the group consisting of ditertiary butyl peroxide, 2,5-dimethyl-2,5-di(tertiary butyl peroxy) hexane, tertiary butyl peroxy acetate and tertiary butyl peroxy isopropyl carbonate in an amount of catalyst of about 0.01 to 0.5% by weight, and and about 0.005 to 0.2% by weight, respectively, based on the weight of the monomers, and maintaining the temperature at a first level of about 90.degree. to 110.degree.C until the conversion of the monomers reaches 70%, and then, increasing the temperature to a second level in excess of said first level in the range of about 110.degree. to 140.degree.C until completion of the polymerization.

2. The process of claim 1, wherein said azo catalyst is 1,1'-azobiscyclohexanitrile or 1,1'-azobiscycloheptanitrile, and said peroxide catalyst is tertiary butyl peroxy isopropyl carbonate.

3. The process of claim 1, wherein said peroxide catalyst is added when the conversion of monomers has reached 70%.

4. The process of claim 1, wherein a dispersing agent selected from the group consisting of tricalcium phosphate, trisodium phosphate, sodium phosphate, calcium chloride or disodium phosphate is present in said process as a dispersing agent.

5. The process of claim 1, wherein a compound selected from the group consisting of tertiary dodecyl mercaptan, normal dodecyl mercaptan, an unsaturated dimer of .alpha.-methylstyrene, trichloroethylene and terpinolene is present as a molecular weight adjuster.
Other info:


Inventors: Takizawa, Hidehiko (Ichihara, JA)
Hisashige, Mitsuto (Ichihara, JA)

Application Number: 465655
Filing Date: 1974-04-30
Publication_date: 1976-01-06
Assignee: Denki Kagaku Kogyo Kabushiki Kaisha (Tokyo, JA)
Primary Class(es): 526/219.1 526/219, 526/219.2, 526/219.3, 526/342
Other Classes:
US Patent Ref:
2658057Nov, 1953Park260/85.
3032540May, 1962Ross et al.260/85.
3198775Aug, 1965Delacretaz260/85.
3738972Jun, 1973Moriyama et al.260/85.
3763128Oct, 1973Lewis et al.260/89.

Other Refs:
Primary Examiner: Schofer, Joseph L.
Assistant Examiner: Tungol, Maria S.
Attorney: Sughrue, Rothwell, Mion, Zinn & Macpeak